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Future Policy Benefits and Claims - Gross Premiums or Assessments and Interest Accretion (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | $ 5,212.2 | $ 4,938.7 | $ 3,864.3
Interest accretion | 2,093.1 | 1,975.0 | 2,142.5
Retirement and Income Solutions |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 3,149.7 | 2,948.4 | 1,971.1
Interest accretion | 1,343.5 | 1,227.7 | 1,165.4
Retirement and Income Solutions | Pension risk transfer |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 3,103.1 | 2,905.9 | 1,941.0
Interest accretion | 1,135.1 | 1,008.6 | 935.7
Retirement and Income Solutions | Individual fixed income annuities |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 46.6 | 42.5 | 30.1
Interest accretion | 208.4 | 219.1 | 229.7
Principal Asset Management | International Pension | Latin America | Individual fixed income annuities |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 29.0 | 29.7 | 78.8
Interest accretion | 330.2 | 385.8 | 662.0
Benefits and Protection |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 2,028.6 | 1,955.5 | 1,809.2
Interest accretion | 410.1 | 351.9 | 305.3
Benefits and Protection | Specialty Benefits | Individual disability |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 640.0 | 624.6 | 601.0
Interest accretion | 99.8 | 94.5 | 90.2
Benefits and Protection | Life Insurance | Universal life |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 715.3 | 681.8 | 577.7
Interest accretion | 253.3 | 209.2 | 171.2
Benefits and Protection | Life Insurance | Term life |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 673.3 | 649.1 | 630.5
Interest accretion | 57.0 | 48.2 | 43.9
Corporate | Long-term care insurance |  |  |
Future Policy Benefits and Claims |  |  |
Gross premiums or assessments | 4.9 | 5.1 | 5.2
Interest accretion | $ 9.3 | $ 9.6 | $ 9.8

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